Yeah, gotta agree with this one, stuttering is not directly linked to breathing/irregularities, but studies show that properly regulated breathing can reduce stuttering to a great extent. ​ 1. A rapid method of eliminating stuttering by a regulated breathing approach(1974,Azurin) (Possibly out of date) " Analysis of the data of the individual clients showed that stuttering was reduced by at least 85 per cent for all clients on the very first day after treatment and by at least 93 per cent on the last follow-up day available for a client. Also. on the last available follow-up report. all reported that they stuttered so few times and so mildly that they no longer considered stuttering a problem for them" ​ 2. Comparison of Regulated-Breathing Versus Abbreviated Desensitization on Reported Stuttering Episodes (1979 Azrin) ​ " The regulated-breathing method reduced the reported stuttering episodes by 94% on the first day after training and by 97% during the fourth week and the three-month follow-up. The control procedure reduced reported stuttering only slightly (about 10%). The results indicate substantial effectiveness of the regulated-breathing method for reducing reported stuttering episodes in everyday speech as compared with an alternative treatment of equal duration." ​ 3. The regulated-breathing method for stuttering: An experimental evaluation(1988) "The present study indicates that the Howie P., Woods G. L. and Andrews G. (1982) Relationship between covert and overt speech measures regulated-breathing method results in signifi- immediately before and immediately after stuttering cantly long-lasting improvement of fluent treatment speech in adults. Particularly because this method is a potentially cost effective treatment program for adult stutterers" ​ Theres more research papers, but I am at uni and have class very soon. I think therapy is not a one size fits all thing, different severity have different needs,requirements and goals. ​